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ECOREGIONS OF THE UPPER MIDWEST STATES
Citation:
Omernik, J.M. AND A. Gallant. ECOREGIONS OF THE UPPER MIDWEST STATES. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-88/037 (NTIS PB89138440), 1988.
Description:
A map of ecoregions of the Upper Midwest States was compiled to give managers of aquatic and terrestrial resources a better understanding of the regional patterns of attainable quality of these resources. The ecoregions represent areas that are relatively homogeneous in patterns of combinations of factors including land use, land-surface form, potential natural vegetation, and soils. Descriptions and photographs provide a synopsis of the major characteristics affecting and distinguishing each ecoregion. A synoptic approach, similar to that used in defining the ecoregions, is also useful for applications of the map. Initial efforts to use the framework are at the State level of aquatic resource management and center on identifying attainable ranges in chemical quality, biotic assemblages, and lake trophic condition.